I am making an EEG device from a surplus Mindflex circuit board and an Uno. I am still laying-out the boards, power lines, and skin electrode apparatus. I thought this might be a good time to ask for thoughts about the project.
The Mindflex on/off LED works, but I don't know yet if it outputs anything useful. Unlike the original toy, it will be a bench apparatus, not connected by wireless. Most hacks explain how to bypass the toy's proprietary radio with Bluetooth.
My layout will run a wire from the Mindflex TX contact to an Uno analog pin, and from both gnd-to-gnd. A voltage connection between boards is not needed, since the Mindflex has its own power supply (3 AA batteries).
I will upload the "Smoothing" example sketch, without modification, as found in the Arduino, IDE 3.Analog menu list, to the Uno board.
If everything goes as planned, EEG data should print as a continuous line graph on the IDE desktop display.
For skin electrodes, I will first try a small patch of aluminum foil under a Band-Aid, applied to my forehead and neck, with fine-gauge, ear bud-type wire running back to the Mindflex board inputs.
The solder connections are the only thing I haven't figured out. They are the smallest I have ever attempted. I am rehearsing various approaches in my mind's eye.
Other than that, this should work, right?